help needed: problem with UNIBUS access on my PDP-11/70

From: Gooijen H <>
Date: Wed Jul 17 01:58:00 2002

> Gooijen H wrote:
> > By experiment I will check the NPR wire of the other
> > UNIBUS slots. You know why once you have seen the
> > backplane of an 11/70.
> Johnny Billquist <> wrote:
> > Huh? It's no more difficult checking the NPR wire in the
> > 11/70, than on any other Unibus backplane. And it *is*
> > rather simple to see if the jumper is there or not.
> On the 11/70 Mike and I have been working on, the NPR grant
> jumpers were wrapped before most of the other wiring, rather
> than after. This makes it fairly difficult to see them.

On the 11/70 backplane I have, the NPR grant is also wired
before all other wires. That is what makes me nervous when I
start thinking about cutting a wire for a DMA device.
A DD11-DK 9 slot gen purpose backplane is a lot easier when
it comes to accessing the NPR wires. I agree that *looking*
with a good light source is not too difficult.

- Henk.
Received on Wed Jul 17 2002 - 01:58:00 BST

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